JPH0547767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-point wide range length measuring device that automatically measures a wide range of lengths such as outer diameter, inner diameter, and width.

In general, for a high-precision two-point wide-range length measuring device, it is important that the two measurement contacts that contact the object to be measured open and close with good parallelism and straightness over a wide length measurement range. The configuration of a conventional wide range length measuring device will be explained based on the drawings.

FIG. 1 is a side view showing a part of a conventional wide range length measuring device in cross section.

On the back side (left side when facing the figure) of a box-shaped main body 1 having an opening 1' on one side wall surface, a screw support 2 vertically disposed between the upper wall and the lower wall is provided with a desired outer diameter. A left-handed threaded portion 3 and a right-handed threaded portion 4 are provided at the upper and lower positions with an interval, respectively, and the left-handed threaded portions 3 and 4 are disposed at the upper and lower positions, respectively.
The elongated movable bodies 5 and 6 protrude from the opening 1' and are screwed together with a screw hole bored at an intermediate position, and are driven parallel to each other and symmetrically by the screw strut 2. They are configured to open and close in synchronized vertical directions.

A hole is vertically bored at an intermediate position in the axial direction of each of the movable bodies 5 and 6, and the end thereof is fixed between the upper wall and the lower wall in parallel with the screw column 2. It is configured to fit into the support column and to slide vertically in parallel. Further, at an intermediate position between the movable bodies 5 and 6, on corresponding side surfaces, there is a detector for detecting minute displacements, that is, a reading head 7, which protrudes in a direction 90 degrees (perpendicular) to the axial direction (longitudinal direction). Scale 8 is attached.

Furthermore, the movable bodies 5 and 6 have measurement contacts 9 and 1 of an L-shaped detector at their protruding ends, respectively, so as to sandwich and measure the member to be measured 11.
0 are installed in series. That is, when the member to be measured 11 is held between the ends of the measurement contacts 9 and 10 and stopped, the length is measured by calculating the amount of wide range displacement by the scale 8 and the amount of displacement of the detector.

In the conventional wide-range length measuring instrument having the above configuration, when the screw column 2 rotates, the movable bodies 5 and 6 move vertically with good parallelism and straightness, and the object to be measured is
When the outer diameter of 1 is held between the upper and lower directions, the reading head 7 and the scale 8 calculate and measure the wide range displacement amount and the minute displacement amount of the detector.

The above measurement method has a problem in that the electrical circuit is complicated and errors are likely to occur because the calculation is performed electrically. Furthermore, since the movable body protrudes from the elongated hole opening 1' on the side wall facing the member to be measured and moves over a wide range, it is difficult to construct a completely waterproof structure.

Next, the configuration of the conventional wide range length measuring device shown in FIG. 2 will be explained based on the drawings.

FIG. 2 is a side view showing a part of a conventional wide range length measuring device in cross section. In addition, in the figure, regarding the same configuration and the same members as the conventional example shown in FIG. 1 above,
The same reference numerals will be used and the description thereof will be omitted.

As shown in FIG. 2, L-shaped movable members 12 and 13 open and close with good parallelism and straightness in synchronization with each other by driving the screw struts 2, as in FIG.
are configured by screwing the left and right screws 3 and 4 of the screw strut 2 and their base ends, respectively. Further, the bent end portions of the movable members 12 and 13 are each formed into a pipe shape, and are configured to be fitted into holes bored in the upper and lower wall surfaces of the main body 1 so as to be freely movable up and down.

Measuring shafts 14 and 15 are slidably fitted into the cylindrical ends of the bent ends of the movable members 12 and 13, respectively, and the end portions of the measuring shafts 14 and 15 are arranged in the L-shape of each of the movable members 12 and 13. It is formed so as to protrude outward from the end surface of the tip bent portion. Furthermore, L-shaped measurement contacts 9 and 10 are attached to the tip surfaces of the protruding measurement shafts 14 and 15, respectively, and are configured to clamp and measure the member to be measured 11 from above and below.

A reading head 7 and a scale 8 are disposed on the base end faces of the measuring shafts 14 and 15 to detect the amount of displacement measured by the measuring contacts 9 and 10 on the member to be measured 11.

That is, the measuring member 11 is sandwiched between the measuring contacts 9 and 10, and its dimensions (displacement amount) can be detected by the scale 7 and the reading head 8. In addition, there is a gap in the axial direction between the mounting portions of the reading head 7 and scale 8 connected to the measurement shafts 14 and 15, and the bent portions of the L-shaped cylindrical portions of the bent ends of the movable members 12 and 13. 1
6 and 17, respectively, and intervening elastic members 18 and 19 biased in the axial direction, respectively, to maintain the movable range of the gaps 16 and 17,
The measuring shafts 14 and 15 are configured to be slidable with high precision. That is, the elastic member 1 is placed between the gaps 16 and 17.
The measuring contacts 8 and 19 are configured to sandwich and abut the member 11 to be measured of the measuring contacts 9 and 10, and to act as a measuring force when the measuring contacts 9 and 10 stop.

The wide range length measuring device having the above configuration has movable members 12 and 1.
The measuring shafts 14 and 15 slide in the axial direction inside the cylindrical part at the bending point provided at the tip of 3.
A portion 16 is provided between the movable members 12 and 13 and the measuring shafts 14 and 15.
When the measuring contacts 9 and 10 slide due to the elastic members 18 and 17 and come into contact with the member to be measured 11 and stop, it acts as a measuring force, and the displacement of the measuring contacts 9 and 10 at that time is expressed as a scale 8. Detected by the reading head 7.

The wide-range length measuring device with the above configuration does not require electrical calculations compared to the one shown in Figure 1, and can measure a wider range of length because it has a dual configuration of a measuring axis, an intermediate shaft, and a bearing. However, since the movable parts have a double structure and each slides with good parallelism and straightness, the structure is complicated and the cost is also low. There were problems such as being expensive.

The present invention was created in order to solve the above-mentioned problems, and an object of the present invention is to provide a wide range length measuring device that has a simple configuration and is capable of measuring lengths with high precision at low cost.

Embodiments of the present invention will be described based on the drawings. In the drawings, the same configurations and members as in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

FIG. 3 is a side view showing a part of the wide range length measuring device according to the present invention in cross section.

As shown in the figure, at the outer end of the upper wall surface of the main body 1,
An electric motor 20 that drives the screw strut 2 is provided. In addition, the left and right threaded portions 3 formed on the threaded support 2
Movable bodies 21 and 22, each having a cylindrical shape and having a brim shape formed on opposite end sides thereof, are screwed onto and 4, and screws 37 and 38 for rotation are fitted into grooves formed in the axial direction. are configured to move up and down between the threaded portions 3 and 4, respectively.

At the edges of the above-mentioned collar-shaped parts of the movable bodies 21 and 22,
The actuating rods 23 and 24 are fitted into holes drilled at the base ends of horizontally long operating rods 23 and 24, respectively. On the outer peripheral surfaces of the movable bodies 21 and 22 between the upper end surface of the operating rod 23 and the lower end surface of the operating rod 24, elastic members 25 and 26, which are biased in the axial direction, are interposed, respectively.
an elastic member disposed at the end opposite to the flange-shaped portion;
It is constituted by a ring-shaped regulating member that regulates the biasing of 25 and 26. Also, movable bodies 21 and 2
When the elastic members 25 and 26 are moved in the vicinity of the flange-shaped portion 2, there are gaps 27 and 2 at a predetermined interval.
A control ring for regulating the operation of the actuating rods 23 and 24 is provided so that the actuating rods 23 and 24 are configured as shown in FIG.

At the tips of the actuating rods 23 and 24, holes are bored, respectively, and circular measuring shafts 29 are formed extending vertically.
and the proximal end of 30 is fixed. On the other hand, the measuring axis 29
and 30 are configured to fit into holes drilled in the upper and lower wall surfaces of the main body 1 into sliding bearings 31 and 32, respectively, and protrude to the outside.

On the tip surfaces of each of the measurement shafts 29 and 30, there is a
The proximal ends of the shape-shaped measurement contacts 33 and 34 are attached, and the member to be measured 11 is held and measured at the tips from above and below.

A reading head 7 and a scale 8 are disposed on surfaces facing each other at an intermediate position of the operating rods 23 and 24 for measuring the amount of displacement of the member 11 to be measured when the measuring contacts 33 and 34 sandwich the member 11 to be measured.

Further, limit switches 35 and 36 are provided on the surfaces of the operating rods 23 and 24 opposite to the surfaces on which the reading head 7 and scale 8 are disposed, that is, on the upper and lower wall sides of the operating rods 23 and 24, respectively. The elastic members of the movable bodies 21 and 22 are configured to open and close with the inner end surfaces of the regulating members of the respective elastic members. That is, the measurement contacts 33 and 34 are held in contact with the member to be measured 11, and the measurement shafts 29 and 30 are
and operating rods 23 and 24, it operates against the tension of elastic members 25 and 26, and the operating rods 23 and 2
Limit switches 35 and 36 are configured to operate between 27 and 28 between the end faces of 4.

The operation of this embodiment with the above configuration will be explained.

The state shown in the drawing is such that the operating rods 23 and 24 are spaced apart from each other, and the measuring contacts 33 and 34 are also spaced apart from each other. In this state, when the member to be measured 11 is inserted between the measurement contacts 33 and 34, the electric motor 20 is activated and the screw column 2 is rotated. As the screw support 2 rotates, the movable bodies 21 and 22, which are screwed together, are separated and moved in the vertical direction by detents 37 and 38, respectively.

Due to this movement, the operating rods 23 and 24 have their base ends pressed against the collar forming surface by the elastic members 25 and 26, so that they move as one in the closing direction in synchronization with each other. This movement causes the measurement contacts 33 and 34 to mutually move in the closing direction and stop when they come into contact with the member to be measured 11. However, there is a gap between the movable bodies 21 and 22 and the operating rods 23 and 24.
27 and 28, it moves further in the closing direction, and the movement is stopped by limit switches 35 and 36 which sense the decrease in the distance between parts 27 and 28.

The displacement of the measuring contacts 33 and 34 is detected by a reading head 7 and a scale 8 mounted on the operating rods 23 and 24.

Further, in the above embodiment, the scale 8 and the reading head 7 are used as the displacement transducer, but the present invention is not limited to this. For example, a differential transformer for detecting long displacement, a linear potentiometer, etc. May be used.

In addition, in the present embodiment, the member to be measured 11
The measurement of the outer diameter was used as an example, but the present invention is not limited to the above embodiments, and the present invention is not limited to the measurement of the outer width (the measurement contacts 33 and 34 may be installed in reverse), the measurement of the inner diameter, and the measurement of the inner width. It is obvious that this is also possible.

Further, in the above embodiment, the vertical movement mechanism of the movable bodies 21 and 22 by the rotation of the screw column 2 is performed by a screwing means, but the present invention is not limited to this. For example, a means of transportation such as a rack and pinion may be used.

According to the present invention having the above configuration, the parallelism and straightness configuration of the measuring means requires only one measuring shaft and one bearing, so the configuration is simple and the measurement accuracy can be measured with high accuracy, which improves quality and cost. It has excellent effects in

Further, there is an effect that waterproofing of the protruding portion of the measuring shaft is reliable and easy.

[Brief explanation of the drawing]

FIG. 1 is a sectional view from the side showing the main parts of a conventional wide-range length measuring device. FIG. 2 is a sectional view from the side showing the main parts of a conventional wide-range length measuring device. FIG. 3 is a sectional view from the side showing the main parts of the wide range length measuring instrument according to the present invention. 1...Main body, 1'...Opening, 2...Screw support,
3...Left thread part, 4...Right thread part, 5...12,
Movable body, 6...13, Movable body, 7... Reading head, 8... Scale, 9, 10... Measuring contact, 33, 34... Measuring contact, 11... Member to be measured, 12, 13... Movable member, 14, 15
...Measurement axis, 16, 17... Intermediate section, 27, 28
...Between part, 18, 19...Elastic member, 25, 2
6...Elastic member, 20...Electric motor, 21, 22...
...Movable body, 23, 24... Operating rod, 29, 30...
...Measuring shaft, 31, 32...Sliding bearing, 35, 36
...Limit switch.

Claims (1)

[Claims] 1 Bearings configured parallel to the length measurement direction and coaxial with each other are provided so that the openings face the upper and lower wall surfaces of the box-shaped main body, and a pair of upper and lower approximately U-shaped parts protruding from the upper and lower sides of the main body are measured. The shafts are slidably mounted in the bearings, and measurement contactors configured to sandwich and measure the member to be measured are provided at the tips of the pair of measurement shafts, and one end of each of the pair of operating rods is attached to the ends of the pair of measurement shafts. It is fixed to the base end of the shaft, and the other end is movably attached to a movable body having an engaging part, and each of the other ends is connected to the engaging part side by an elastic member that acts as a measuring force of a measuring contact. and a measuring means for detecting the measured dimension value of the member to be measured by the movement of a pair of measuring contacts is provided in each middle of the operating rod, and the movable body is parallel to the length measuring direction and symmetrically synchronized with each other. A wide range length measuring instrument equipped with a driving means that opens and closes in a straight line.